Air delivery conduit

ABSTRACT

A mask system and an air delivery conduit ( 200 ) for use in the treatment of respiratory disorders. The air delivery conduit ( 200 ) may comprise a textile ( 220 ) having an airtight arrangement. A support structure ( 240 ) may be provided to the conduit to provide form.

CROSS-REFERENCE TO APPLICATION

This application claims the benefit of Australian ProvisionalApplication No. 2011900911, filed. Mar. 15, 2011, which is incorporatedherein by reference in its entirety.

FIELD OF TECHNOLOGY

The present technology relates to air delivery conduits used in PositiveAirway Pressure (PAP) systems for treatment, e.g., of Sleep DisorderedBreathing (SDB), such as Obstructive Sleep Apnea (OSA), with ContinuousPositive Airway Pressure (CPAP) or Non-Invasive Positive PressureVentilation (NIPPY).

BACKGROUND OF TECHNOLOGY

PAP systems to deliver breathable gas to a patient typically include aPAP device, an air or gas delivery conduit, and a patient interface. Inuse, the air delivery conduit delivers pressurized air or gas from thePAP device to the patient interface in contact with the patient's face.

The present technology provides improvements to known air deliveryconduits.

SUMMARY OF TECHNOLOGY

One aspect of the disclosed technology relates to an air deliveryconduit having increased comfort and visual appeal.

Another aspect of the disclosed technology relates to an air deliveryconduit comprising a textile.

Another aspect of the disclosed technology relates to an air deliveryconduit that is quiet, unobtrusive and/or appealing to consumers, andincludes a textile.

Another aspect of the disclosed technology is an air delivery conduitfor use with a facial mask which is constructed and arranged to lengthenor contract without twisting or disrupting a seal of the facial mask.

Another aspect of the disclosed technology relates to an air deliveryconduit including a textile that has a first elasticity in a firstdirection and a second elasticity in a second direction.

Another aspect of the disclosed technology relates to an air deliveryconduit including a textile that is made airtight.

Another aspect of the disclosed technology relates to an air deliveryconduit comprising a textile, the air delivery conduit having a smoothinner surface.

Another aspect of the disclosed technology relates to an air deliveryconduit comprising a textile, the air delivery conduit having areinforcing structure, e.g., to provide some level of crush resistance,which reinforcing structure may take the form of a continuous member(e.g., a helix) or a discontinuous member or members (e.g., a linear,curved, or zig-zag stiffener provided along the conduit).

Another aspect of the disclosed technology relates to an air deliveryconduit comprising a textile having an airtight arrangement and areinforcing structure.

Another aspect of the disclosed technology relates to an air deliveryconduit comprising a textile, the textile having a warp and a weft, andthe warp and the weft are arranged to maximize the stretch of the airdelivery conduit in a first direction.

Another aspect of the disclosed technology relates to an air deliveryconduit comprising a textile, the textile having a warp and a weft, andthe warp and the weft are arranged to minimize the torque of the airdelivery conduit in a second direction.

Another aspect of the disclosed technology relates to an air deliveryconduit comprising a textile, the air delivery conduit having a spiralor helix, the air delivery conduit having a first end attachable to amask.

Another aspect of the disclosed technology relates to an air deliveryconduit having a spiral or helix, the air delivery conduit having afirst end attachable to a mask and a second end attachable to a flowgenerator.

Another aspect of the disclosed technology relates to an air deliveryconduit comprising a textile, the air delivery conduit having a spiralor helix, the air delivery conduit having a first end, the first endhaving a first inner diameter and attachable to a mask, and a second endhaving a second inner diameter and attachable to a flow generator.

Another aspect of the disclosed technology relates to an air deliveryconduit having reduced intrusiveness and greater appeal to consumers dueto the use of fabric, thereby increasing compliance rates.

Another aspect of the disclosed technology relates to an air deliveryconduit that is lighter as fabric may be lighter than typical plastics,thereby reducing the effects of the air delivery conduit drag at theinterface.

Another aspect of the disclosed technology relates to an air deliveryconduit having a textile that is able to shear thereby reducing thetorque of the air delivery conduit and hence reducing the air deliveryconduit drag forces. This in turn creates a more stable mask seal andmore effective treatment.

Another aspect of the disclosed technology relates to an air deliveryconduit that is more supple as the warp and weft of the textile havebeen formed to improve the flexibility and extensibility of the airdelivery conduit. The suppleness reduces the air delivery conduit dragand also increases the usability of the air delivery conduit.

Another aspect of the disclosed technology relates to an air deliveryconduit that reduces conduit drag on a mask compared to prior artconduits which may impart substantial torque to a mask which may causethe mask seal to leak.

Another aspect of the disclosed technology relates to an air deliveryconduit that may reduce the need for an additional swivel componentwhich may otherwise be required to be placed inline between the airdelivery conduit and a mask, or between the air delivery conduit and aflow generator.

Another aspect of the disclosed technology relates to an air deliveryconduit comprising a textile (e.g., helically wound) forming a tubularmember adapted to deliver pressurized air, the textile including a warpand a weft (or a machine direction and a transverse direction), whereincharacteristics of the warp and the weft are selected to provide thetubular member with a selected stiffness to at least partiallycounteract twisting of the tubular member about its longitudinal axis.

Another aspect of the disclosed technology relates to an air deliveryconduit comprising a textile (e.g., helically wound) forming a tubularmember adapted to deliver pressurized air, the textile including a warpand a weft (or a machine direction and a transverse direction), whereincharacteristics of the warp and the weft are selected to provide thetubular member with desired features in relation to stretching (e.g.,along the longitudinal axis of the tubular member) and/or to at leastpartially counteract or compensate for twisting about the longitudinalaxis.

Another aspect of the disclosed technology relates to a mask assemblyfor treating sleep disordered breathing, comprising an air deliveryconduit according to an example of the disclosed technology; and apatient interface in communication with the conduit.

Another aspect of the disclosed technology relates to a method offorming an air delivery conduit. The method comprises providing amaterial in an at least partially molten state to form a tubular memberto deliver pressurized air; and curing the material into a hardenedstate, wherein during the curing step a fabric is attached to an outersurface of the material so as to fuse the material and the fabric.

Another aspect of the disclosed technology relates to a method offorming an air delivery conduit. The method comprises forming alaminated fabric sheet including an inner laminate layer and an outerfabric layer; and welding opposing end portions of the laminated fabricsheet to form a tubular conduit having a longitudinal weld seam.

Another aspect of the disclosed technology relates a method of formingan air delivery conduit. The method comprises providing a tubular memberto deliver pressurized air; providing a fabric to cover the tubularmember; and molding a cuff to the tubular member, wherein the fabric isfused with the cuff during the molding step.

Another aspect of the disclosed technology relates to a method offorming an air delivery conduit. The method comprises laminating,coating or otherwise adding a polymer to a fabric sheet; and forming thefabric sheet into a tubular shape thereby forming a conduit to deliverpressurized air, wherein the laminated polymer provides form to theconduit.

Other aspects, features, and advantages of the disclosed technology willbecome apparent from the following detailed description when taken inconjunction with the accompanying drawings, which are a part of thisdisclosure and which illustrate, by way of example, principles of thistechnology.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings facilitate an understanding of the variousembodiments of the technology. In such drawings:

FIG. 1 is a mask system according to an example of the disclosedtechnology;

FIG. 2-1 is a side view of an air delivery conduit according to anexample of the disclosed technology;

FIG. 2-2 is a partial perspective view of the air delivery conduit ofFIG. 2-1;

FIG. 2-3 is a cross-sectional view along the line 2-3-2-3 in FIG. 2-2;

FIG. 2-4 is a cross-sectional view of an air delivery conduit accordingto another example of the disclosed technology along a line similar tothe line 2-3-2-3 in FIG. 2-2;

FIG. 2-5 is a cross-sectional view of an air delivery conduit accordingto another example of the disclosed technology along a line similar tothe line 2-3-2-3 in FIG. 2-2;

FIG. 3 is a cross-sectional view of an air delivery conduit according toan example of the disclosed technology;

FIG. 4 is a front end view of an air delivery conduit according to anexample of the disclosed technology;

FIG. 5 is, a side view of an air delivery conduit and cuff according toan example of the disclosed technology;

FIG. 6 illustrates a process of forming an air delivery conduitaccording to another example of the disclosed technology; and

FIG. 7 is a partial perspective view of an air delivery conduitaccording to another example of the disclosed technology.

DETAILED DESCRIPTION OF ILLUSTRATED EXAMPLES

The following description is provided in relation to several examples(most of which are illustrated, some of which may not) which may sharecommon characteristics and features. It is to be understood that one ormore features of any one example may be combinable with one or morefeatures of the other examples. In addition, any single feature orcombination of features in any of the examples may constitute additionalexamples.

In this specification, the word “comprising” is to be understood in its“open” sense, that is, in the sense of “including”, and thus not limitedto its “closed” sense, that is the sense of “consisting only of”. Acorresponding meaning is to be attributed to the corresponding words“comprise”, “comprised” and “comprises” where they appear.

The term “air” will be taken to include breathable gases, for exampleair with supplemental oxygen. The respiratory therapy devices or blowersdescribed herein may be designed to pump fluids other than air.

One or more examples may include exemplary dimensions. Although specificdimensions and ranges may be provided, it is to be understood that thesedimensions and ranges are merely exemplary and other dimensions andranges are possible depending on application. For example, ranges thatvary from those provided, e.g., up to or more than, −/−10% may besuitable for particular applications.

1. PAP System

A PAP system (e.g., CPAP system) typically includes a PAP device(including a blower for generating air at positive pressure), an airdelivery conduit (also referred to as a tube or tubing), and a patientinterface (e.g. a mask) adapted to form a seal with the patient's face.In use, the PAP device generates a supply of pressurized air (in therange of 2-40 cm H₂O, approximately 8-12 cm H₂O for OSA treatment) thatis delivered to the patient interface via the air delivery conduit. Thepatient interface or mask may have suitable configurations as is knownin the art, e.g., full-face mask, nasal mask, oro-nasal mask, mouthmask, nasal prongs, nozzles, cradle, etc. Also, headgear may be utilizedto comfortably support the patient interface in a desired position onthe patient's face.

2. Mask System

In an example, a mask system may include a frame, a cushion andheadgear. The frame may anchor the cushion in position and allow forattachment of the headgear. The frame may be a rigid or semi rigidcomponent. The cushion may seal with the patient's face in order toprovide therapy to the patient. The cushion may be a flexible element.The headgear may stabilize and support the frame and cushion in positionon the patient's face when in use. The headgear may be a flexible orsemi rigid element, or a combination thereof, and may be constructed offabric, for example.

FIG. 1 illustrates a mask system 100. The mask system 100 includes aframe 120, a cushion 140 and headgear 160. The frame 120 anchors thecushion 140 in position. The frame 120 may be a rigid or semi rigidcomponent constructed of, for example, polycarbonate. The cushion 140may be a flexible element constructed of, for example, silicone toprovide a comfortable fit to the patient.

The mask system 100 may include a forehead support 150 and an elbow 170.The forehead support 150 may include a beam 152 and at least oneforehead pad 154. The beam 152 may extend between the frame 120 and theforehead pad 154. The forehead pad may rest on the patient's foreheadand receive a headgear 160.

The elbow 170 includes a first end that interfaces with an aperture inthe frame 120, and a second end adapted to connect to an air deliverytube 200. Tube 200 may connect or sealingly engage with a flow generatorthat delivers pressurized breathable gas to the patient.

The headgear 160 is adapted to secure the mask system 100 to thepatient's face. The headgear 160 may connect to the frame 120 and/orforehead pad 154 via an attachment device, e.g., clips, loops or othersuch devices. Further, an air delivery conduit 200 may be connected tothe elbow to supply pressurized air to the mask.

3. Air Delivery Conduit

FIGS. 2-1 to 2-3 illustrate an air delivery conduit 200 according to anexample of the disclosed technology. The air delivery conduit 200 maycomprise an outer textile or fabric layer 220, an inner laminate layer230 and a support structure 240 attached to an outer surface of thetextile 220.

The air delivery conduit 200 may be generally cylindrical althoughalternative shapes may be possible also, for example, oval, square, etc.The textile 220 may be woven, non-woven, spacer fabric, knitted, braidedor 3-D printed, for example. The textile 220 may be formed from a planarpiece of material that is wrapped and joined along a longitudinal axisto create a tubular or other shape. The textile layer 220 may be formedby winding a textile sheet around a central axis in a helicalarrangement to form a tubular configuration. The air delivery conduit200 may include cuffs 202 for attachment to an air supply source and/ora mask.

Additionally, the textile 220 may be formed in one piece by weaving,knitting or braiding, for example. Also, the textile itself and othercomponents of the air delivery conduit may be assembled or joined bylamination, welding, gluing, stitching, kitting, etc.

The textile may be arranged to have increased or reduced elasticity,stretchability or stiffness in certain directions. For example, thethreads or fibres of the textile may have varying elasticities orstiffnesses and the elasticities (or level of stiffness) may be selectedto provide increased or reduced elasticity, stretchability or stiffnessof the textile in certain directions. These directions may include, forexample, the directions of the warp and weft of a woven textile, thewarp direction and the weft direction of a knitted textile, and themachine direction and the transverse direction of other textiles (e.g.,nonwoven).

In the example of a woven textile, the textile 220 may include a warpand a weft. The warp corresponds to the fibers or threads running alongthe length of the material. The warp corresponds to the fibers orthreads running along the width of the material. Therefore, the warp ofthe textile 220 may be parallel to the central axis of the air deliveryconduit 200. The weft of the textile conduit 220 may correspond to thecircumference of the air delivery conduit 200.

However, if the textile 220 is wound about in a helical arrangement, thewarp of the textile 220 may be arranged to follow the helix and the weftmay be arranged along the longitudinal axis of the conduit, as shown inFIG. 2-2. In FIG. 2-2, the arrow A corresponds to the helix of thetextile and represents the warp, and the arrow B is in the direction ofthe longitudinal axis of the conduit and represents the weft.

The warp and the weft may comprise different fibers or threads. Forexample, the weft may be formed of a material that has more stretch oris more elastic than the warp. In this configuration, the textile 220may be able to stretch more readily in a lengthwise direction, i.e.along its central axis due to the elasticity or stretchiness of theweft. The textile 220 also may more readily stretch when the conduit isbent, due to the increased stretchability of the weft. This may causethe air delivery conduit 200 to be more supple or more readily deformand thereby reduce conduit drag.

Furthermore, the textile 220 in this arrangement may exhibit anincreased resistance to torque or twisting when the air delivery conduit200 is pulled or a lengthwise force is applied to the air deliveryconduit, due to the less elastic material of the warp. Rather, thetextile 220 may shear to absorb the force. This behavior is unlikeconventional extensible air delivery conduits (for example, some plasticair delivery conduits) that twist when they are extended or pulledlengthwise. Conventional extensible air delivery tubes may comprise aweb and a support structure (or helix) wound around a central axis toform the tube. The web and helix may be formed from materials that arenot intended to be extensible under normal loading conditions for sleepapnea therapy. Thus, when the tubes are pulled along their axis, thehelix attempts to straighten out, but since the helix is wound, ittwists. Since the web is substantially inextensible, the web will twistwith the helix thereby causing the whole tube to twist. Accordingly, inan example of the disclosed technology, the warp and well may bearranged to resist such twisting.

A further advantage of the warp having little to no stretch orelasticity is that the conduit may be formed to have a more uniformconfiguration. That is, when the conduit is formed, the textile is woundaround the central axis and since the warp has little elasticity, thematerial is less likely to deform when wound, thus creating a moreuniform air delivery conduit.

In another example, the warp may be formed of a material that has morestretch or is more elastic than the well. In this configuration, thetextile 220 may have limited to no ability to stretch lengthwise oralong its central axis due to the lack of elasticity of the weft. Thelimited stretchiness or elasticity of the well may also limit theability for the textile 220 and thus the conduit 200 to bend or curve.This may be desirable when a position of the air delivery conduit is toremain stable, such as in the case of an air delivery conduit that issecured on the patient's head or night gown. Furthermore, as the warphas a higher elasticity, the air delivery conduit may exhibit a reducedresistance to torque or twisting or may readily torque or twist, forexample when pulled or a lengthwise force is applied.

The inner laminate layer 230 may be formed on an inner surface of thetextile 220, as shown in FIGS. 2-3 to 2-5. The inner laminate 230 mayprevent air from leaking through the fibers of the textile 220. Theinner laminate 230 may be glued, melted, sprayed or otherwise formed onthe textile 220. The inner laminate may also be embodied as part of thetextile and may react, to heat for example, to form a sealing layer onthe textile 220. For example, the inner laminate could form aheat-activated adhesive backing of the textile 220 that once activatedcould form a sealing layer. The inner laminate could be activated as thetextile is wound to form a tubular shape or could be activated once theentire textile is arranged in the tubular shape. Further, the laminate230 may be formed from polyurethane, silicone, nylon or other flexible,substantially impermeable materials.

It is noted that the textile 220 may not require a laminate to make theair delivery conduit airtight. For instance, the textile 220 may besufficiently impervious to air flow, or otherwise airtight, e.g., thetextile may include a canvas.

As shown in FIGS. 2-3 to 2-5, support structure 240 may form a helix,and may further be constructed to form a spring. However, the supportstructure may include other configurations, e.g., a series of ringsalong the length of the textile. Generally, the support structureprovides form to the conduit. That is, the conduit will adopt the shapeof the support structure. The support structure also providescrush-resistance to the conduit, while maintaining flexibility of theconduit. The support structure 240 may be formed of a resilient materialhaving sufficient hardness to maintain the air delivery conduit 200 inan open position should the air delivery conduit 200 be subjected to acompression force. For example, if the patient were to lie on the airdelivery conduit, the air delivery conduit would remain patent or atleast partially open. The support structure 240 may be formed fromnylon, polypropylene, high durometer silicone (e.g. 80 Shore A), metalor other suitable materials. The support structure 240 may providestructural integrity to the air delivery conduit, and may further permitflexibility lengthwise and rotationally.

Preferably, the air delivery conduit 200 has a smooth inner surface. Thesmooth inner surface may be formed by the inner laminate 230. The smoothinner surface provides an advantage over air delivery conduits havingcorrugations or steps as the air travelling through the air deliveryconduit 200 has a lower impedance because the airflow is not interruptedby undulations, steps or corrugations in the conduit wall. Furthermore,the air delivery conduit 200 may have a lower noise output as theairflow can travel along the air delivery conduit with less turbulencebecause the air does not collide with steps, corrugations or undulationsin the conduit side wall.

In an example, the air delivery conduit 200 may have a length in therange of about 200-700 mm, preferably about 200-400 mm, and morepreferably about 300 mm. Further, the length of the air delivery conduitmay be greater than 200 mm.

In another example, the air delivery conduit 200 may have a length thatis at least 1000 mm, preferably 2000 mm. Further, the air deliveryconduit 200 may have a length that is greater than 2000 mm.

In another example of the disclosed technology, an air delivery conduit200-1 may comprise a textile layer 220-1, an inner laminate layer 230-1,an outer laminate layer 234-1 and a support structure 240-1.

The air delivery conduit 200-1 is similar to the air delivery conduit200 described above, except for the inclusion of the outer laminatelayer 234-1.

The outer laminate 234-1 may be formed on an outer surface of thetextile 220-1 and may also cover the support structure 240-1. The outerlaminate 234-1 may prevent air from leaking through the fibers of thetextile 220-1 and may also protect the support structure 240-1. Theouter laminate 234-1 may also provide structural integrity or stiffnessto the air delivery conduit 200-1 to assist in preventing occlusion ofthe air delivery conduit. The outer laminate 234-1 may be glued, melted,sprayed or otherwise formed on the textile 220-1. The outer laminate234-1 may comprise a fabric or other soft conformable material toenhance patient comfort and visual appeal. The outer laminate 234-1 maybe polyurethane, silicone, nylon or other flexible, substantiallyimpermeable materials.

Alternatively, as shown in FIG. 2-5, an air delivery conduit 200-2 mayinclude an outer laminate 234-2 disposed between a textile 220-2 and asupport structure 240-2 such that support structure 240-1 is the outermost portion of the air delivery conduit 200-2. It is noted that theouter laminate 234-2 may also be embodied as part of the textile 220-2as described above with regard to the inner laminate 230. An innerlaminate 230-2 may be formed on an inner surface of the textile 220-2.

In another example of the disclosed technology, the textiles may bereplaced with a polymer or composite structure having a differentelasticity in different directions, e.g. axial and radial directions.Preferably the air delivery conduit is elastic and stretches along itslength with little torque as it expands or contracts along its length.In one form, a post-processing step may be used, e.g. temperatureannealing, to impart differential axial and radial elasticity.

3.1 Fused Tube and Fabric

In an example of the disclosed technology, shown in FIG. 3, a textile310 may be fused to a tubular member 302 to form an air delivery conduit300. For example, the tubular member may comprise a plastic materialformed by an extrusion process. After the tubular member 302 is extrudedand while the tubular member is in at least a partially molten state,the textile 310 is wound around the tubular member. As the tubularmember hardens, the textile 310 is fused to the tubular member 302, thusproviding a softer, more visually appealing outer surface to the airdelivery conduit 300, which may enhance comfort to the patient and/orincrease patient compliance.

The textile may be a fabric, ribbon, or other soft material. The textile310 may further comprise a composite material, e.g., a fabric outerlayer and an adhesive inner layer to adhere to the tubular member 302.

The textile may be helically wound around the tubular member, and maycomprise any textile configuration described in other examples of thedisclosed technology. For example, the stiffness of the tubular member302 and therefore the air delivery conduit may be increased in aselected direction by a textile thread or material that extends in theselected direction and has a higher stiffness than the material of thetubular member 302.

3.2 Fabric with Fusion Zone

A laminated fabric sheet may be formed into a tubular shape and weldedalong a longitudinal axis to form an air delivery conduit 400 having afusion zone 442, as shown in FIG. 4. The laminated fabric sheet maycomprise a textile layer 420 and an inner laminate 430.

The laminated fabric sheet may be welded using a filler material such asa thermoplastic material or adhesive. The filler material may be thesame material as the laminate 430. The filler material may more readilyfuse to the textile 420 and the laminate 430 if the filler material andthe laminate comprise the same material, or are at least chemicallycompatible.

The fusion zone may be configured to be flexible to allow the airdelivery conduit 400 to bend and conform to the patient's movement whilesleeping. The material of the laminated fabric sheet and/or the fillermaterial in the fusion zone may be a flexible material such as a TPE,nylon, polypropylene, silicone and hence may maintain or increase theflexibility of the tube in this region. Alternatively, a stiffermaterial may be used but may have a geometry that permits or enhancesflexibility e.g. thin regions. The fusion zone may also be stretchablealong its length to accommodate stretching of the air delivery conduit400. The textile 420 may comprise any textile configuration described inother examples of the disclosed technology.

3.3 Molded Cuff and Textile Cover

In an example of the disclosed technology, shown in FIG. 5, a textile510 may cover a tubular member 502 to form an air delivery conduit 500.For example, the tubular member may comprise a plastic material formedby an extrusion process. After the tubular member 302 is extruded, thetubular member and the textile 510 may be placed in a tool used to molda cuff 516. Thus, the cuff 516 may be molded directly onto the tubularmember 502 and the textile 510 may be molded into the cuff so as to forma space between the textile 510 and the tubular member 502. The textilecover provides a softer, more visually appealing outer surface to theair delivery conduit 500, which may enhance patient comfort and/orincrease patient compliance.

Longitudinal end portions of the textile 510 may be welded to form alongitudinal seam thereby sealing the textile to prevent debris andbacteria from collecting inside the textile cover.

The cuff 516 may be formed at both ends of the air delivery conduit andmay also function to connect the air delivery conduit to a mask or anair supply source. The cuff may be formed from a polymer such assilicone, thermoplastic, nylon or other suitable materials.

In this example, the warp (i.e. the yarn along the length of the tube)may be more elastic or stretchable than the weft in order to allow thetube to stretch along its length.

3.4 Reinforced Textile Conduit

A textile 620 in sheet form may be provided with a laminated polymerwhich functions as a support structure 640 when the sheet is formed intoa tubular shape thereby forming an air delivery conduit 600, as shown inFIG. 6. The support structure may be laminated as lines, crosses, orother shapes to provide form to the conduit (e.g., the conduit willadopt the shape of the support structure) and encourage the conduit tomaintain a tubular shape, thereby preventing occlusion. In theillustrated example, the polymer is laminated as diagonal lines acrossthe textile sheet. When the sheet is formed into a tubular shape, thediagonal lines form helixes.

The support structure 640 may be formed of a material having sufficienthardness to maintain the conduit 600 in an open position under its ownweight. Preferably, the hardness of the material may also main theconduit in an open position should the conduit be subjected to acompression force, e.g., from the patient's head. The support structure640 may further include a shape or configuration that promotes orrestricts bending in certain areas.

The ends of the textile sheet may be welded (e.g., ultrasonic welded) toform the tubular shape. The textile 620 may have an inner laminate layerto form an air seal.

In an example shown in FIG. 7, an air delivery conduit 700 includes atextile 720 having a support structure 740 formed thereon. The supportstructure 740 has a skeleton configuration; however, otherconfigurations may be suitable, as mentioned above. The supportstructure 740 may be provided along the length of the conduit to provideform and encourage the conduit to maintain a tubular shape. The supportstructure may be provided along a seam of the fabric, such as the fusionzone described above.

While the technology has been described in connection with severalexamples, it is to be understood that the technology is not to belimited to the disclosed examples, but on the contrary, is intended tocover various modifications and equivalent arrangements included withinthe spirit and scope of the technology. Also, the various examplesdescribed above may be implemented in conjunction with other examples,e.g., one or more aspects of one example may be combined with one ormore aspects of another example to realize yet other examples. Further,each independent feature or component of any given assembly mayconstitute an additional example. In addition, while the technology hasparticular application to patients who suffer from OSA, it is to beappreciated that patients who suffer from other illnesses (e.g.,congestive heart failure, diabetes, morbid obesity, stroke, bariatricsurgery, etc.) can derive benefit from the above teachings. Moreover,the above teachings have applicability with patients and non-patientsalike in non-medical applications.

What is claimed is:
 1. An air delivery conduit, comprising: a textileforming a tubular member adapted to deliver pressurized air, the textileincluding a warp and a weft, wherein characteristics of the warp and theweft are selected to provide the tubular member with a selectedstiffness to at least partially counteract twisting of the tubularmember about its longitudinal axis.
 2. The air delivery conduitaccording to claim 1, wherein the characteristics are selected toprovide the tubular member with 1) increased stretchability along thelongitudinal axis and increased resistance to twisting about thelongitudinal axis, or 2) reduced stretchability along the longitudinalaxis and reduced resistance to twisting about the longitudinal axis. 3.The air delivery conduit according to claim 1, wherein the tubularmember readily deforms to reduce drag.
 4. The air delivery conduitaccording to claim 1, wherein the weft is more elastic than the warp. 5.The air delivery conduit according to claim 1, wherein the warp is moreelastic than the weft.
 6. The air delivery conduit according to any oneof claims 1-5, further comprising a first laminate.
 7. The air deliveryconduit according to claim 6, wherein the first laminate is formed on aninner surface of the textile.
 8. The air delivery conduit according toany one of claims 1-7, further comprising a second laminate.
 9. The airdelivery conduit according to claim 8, wherein the second laminate isformed on an outer surface of the textile.
 10. The air delivery conduitaccording to any one of claims 1-9, further comprising a supportstructure to provide the textile with form.
 11. The air delivery conduitaccording to claim 10, wherein the support structure is attached to anouter surface of the textile.
 12. The air delivery conduit according toclaim 11, wherein the support structure is disposed between the secondlaminate, where provided, and the textile.
 13. The air delivery conduitaccording to claim 10, wherein the support structure is attached to anouter surface of the second laminate, where provided.
 14. The airdelivery conduit according to any one of claims 10-13, wherein thesupport structure forms a helix.
 15. The air delivery conduit accordingto any one of claims 1-14, wherein the textile is at least one of awoven fabric, a knitted fabric and a 3-D printed fabric.
 16. The airdelivery conduit according to any one of claims 10 and 11, wherein thesupport structure is laminated to the outer surface of the textile. 17.The air delivery conduit according to any one of claims 1-5, wherein thetextile is substantially impervious to airflow.
 18. The air deliveryconduit according to any one of claims 6-17, wherein at least one of thefirst laminate and the second laminate is embodied as part of thetextile and reacts to heat to form a sealing layer.
 19. The air deliveryconduit according to any one of claims 6-17, wherein at least one of thefirst laminate and the second laminate is attached to the textile withan adhesive.
 20. The air delivery conduit according to any one of claims1-19, wherein the textile forms a tubular shape by welding opposing endportions of the textile to form a longitudinal seam.
 21. A mask assemblyfor treating sleep disordered breathing, comprising: the air deliveryconduit according to any one of claims 1-20; and a patient interface incommunication with the conduit.
 22. The mask assembly according to claim21, further comprising headgear to support the patient interface on apatient.
 23. A method of forming an air delivery conduit, comprising:providing a material in an at least partially molten state to form atubular member to deliver pressurized air; and curing the material intoa hardened state, wherein during the curing step a fabric is attached toan outer surface of the material so as to fuse the material and thefabric.
 24. The method according to claim 23, wherein the fabric ishelically wound around the material.
 25. A method of forming an airdelivery conduit, comprising: forming a laminated fabric sheet includingan inner laminate layer and an outer fabric layer, and welding opposingend portions of the laminated fabric sheet to form a tubular conduithaving a longitudinal weld seam.
 26. The method according to claim 25,wherein the welding step is carried out with a thermoplastic fillermaterial.
 27. The method according to any one of claims 25 and 26,wherein the longitudinal weld seam forms a fusion zone, and the fusionzone is formed to be flexible.
 28. A method of forming an air deliveryconduit, comprising: providing a tubular member to deliver pressurizedair; providing a fabric to cover the tubular member; and molding a cuffto the tubular member, wherein the fabric is fused with the cuff duringthe molding step.
 29. The method according to claim 28, wherein the cuffis formed of a polymer.
 30. The method according to any one of claims 28and 29, further comprising welding opposing end portions of the fabricto seal the fabric thereby providing a longitudinal weld seam.
 31. Amethod of forming an air delivery conduit, comprising: laminating apolymer to a fabric sheet; and forming the fabric sheet into a tubularshape thereby forming a conduit to deliver pressurized air, wherein thelaminated polymer provides form to the conduit.
 32. The method accordingto claim 31, wherein the laminated polymer has a skeleton configuration.